Ten-year-old twins Jemima and Joe Lancelot have no idea why their parents have disappeared, but a mysterious old book belonging to their father holds the answer … and so begins a quest to uncover the truth. Together with Max their Tonkinese cat, and Charlie from next door, the children embark on an epic adventure, travelling back in time to the lost city of Atlantis, unaware of the dangers that await them. Can they save the people of Atlantis from the disaster which is about to destroy their land forever? And will they find their way back to the safety of their own time before it's too late?V